$\left(45+\sqrt{25}\right)\left(45-\sqrt{25}\right)$
$1+\tan^2\left(-6\right)$
$\left(81y\right)^{\frac{3}{4}}$
$8\left(-11+2\right)-3\left(+12-6\right)$
$\lim_{x\to7}\left(\frac{x^2-4x-21}{35-5x}\right)$
$-3m^2n+6m^2n-5m^2n$
$\left(\:7-5+8\right)\:-\:\left[\:3-\:\left(2+7-1\right)\:+3\:\right]$
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